Dredging-scoop



A. E. HALL. Dredging Scoop. No. 231,665. Patented Aug. 31,1880.

Np-Model.) i 2 sheetsQ-sheet 2.

A. E. HALL.

Dredging Scoop. Y Nb. 231,665. Patented Aug.. 31,v 1880.

W mm /M-w .6L/m57 N-FERS, PHOTO-LITHDGFIAPHER. WASHINGTON. D C,

zo jaws closed.

UNTTED STATES PATENT a Orman.

ALBERT E. HALL, OF BOSTON, MASSACHUSETTS.

DREDGlNG-SCOOP.

SPECIFICATION forming part of Letters Patent No. 231,665, dated August 31, 1880. Application led June 12, 1880. (No model.)

To all c hom it may concern:

Be it known that I, ALBERT ELIsHA HALL, of Boston, in the county of Suffolk and Oommonwealth of Massachusetts, have invented a new and useful Improvement in Dredging Scoops or Buckets, of which the following is a specification.-

My present invention relates to and is an' improvement upon the improved dredging scoop or bucket described in the specification in Patent No. 187,005, issued to me February 6, 1877 5 and it consists in additions to and alterations in the construction of the parts of the scoop or bucket most exposed to severe service in dredging, to increase the strength and durability of the whole.

In the drawings annexed, Figure l shows an end view of the dredging-scoop, and Fig. 2 shows a side view of the same with the Fig. 3 shows a horizontal sectional view through the pivots e' and sleeves m m. Figs. 4 and 5 show a perspective and a sectional view of the pivots e.

The same letters indicate the same parts in all the figures.

A A' A A' is the vertical frame of the scoop, each side made of two iiat bars of wroughtiron, of suitable length and dimensions for strength, the upper ends of A A bent upon and securely riveted to A' A', the lower ends of all the bars being parallel to each other and supporting the' shaft of the large central pulley, (marked G,) and the pivots upon which the jaws of the scoop are hinged, and the pul- 'leys marked n n on the shaft F.

\ B B is the scoop or bucket, each of the two sides being the complement of the other, and constituting the jaws of the scoop.

b Z) b b are the hinge-straps, two on each 4o jaw, one at each end,ireaching from the hingepivots on which the jaws of the scoop swing to the circumferential line of the scoop.

b' b' bb' are pockets on the outer ends of the hinge-straps b, one on each, firmly joined to thc hinge-strap by rivets or other suitable means.

b2 b2 are the hinge-pivots, one at each end of the scoop, upon which the inner ends of the hinge-straps, and by them the jaws of the bucket or scoop, are suspended.

c c c c are toggle-bars, the lower ends of which are secured in the pockets b' on the pivot marked c, and the upper ends are secured in the sliding blockI marked D by the pivots marked e4.

c', dotted lines, show the position of the toggle-bars when the jaws of the scoop are open.

e202 are re-enforcing bands, firmly fixed by riveting or other suitable means to the walls of both jaws of the scoop.

D D are sliding blocks of iron, made to move vertically on the frame-pieces A A', into the lower part of which the upper ends oi' the toggle-bars c are securely engaged on the pivots c4, and to the upper parts of which the branched chain g is attached.

D' D', dotted lines, show the position of the sliding block D when the jaws of the scoop are open.

c e e e are pivots through the pockets b', the lower ends of the toggle-bars c, and the hingestraps b, and the walls of the scoop, having a head made with one straight side, which lies against a straight side of a lip on the pocket, thus preventing the pivotfromturning around.

c' e' are pivots through the sliding blocks D D, each pivot extending across the vertical frame and through both sliding blocks, keeping the sides of the frame steady in their relative positions by means of the loose sleeves m and key-fastening at the outer ends of the pivot-bars.

F is the main shaft of the scoop, carrying the large central pulley, G, and the two small pulleys n n, and extends through and is supported by the vertical frames A A', and is secured by keys or other suitable mechanism outsideof the frames.

g is a chain used to open the jaws of the scoop, and is branched at its lower end, the branches extending to and engaging' the upper part of the sliding blocks D. The other end of this chain extends over a pulley on the derrick to the rear end of it, where it is wound on another pulley or drum,which is actuated by suitable mechanism in control of the attendant to raise the sliding blocks D D and open the jaws of the scoop, or lower when the jaws close.

g' is a chain, the lower end of which is securely fastened in the periphery of the large central pulley, Gr, at a point about lequidistant from and between a horizontal andaper- IOC pendicular line through the center of the pulley, the other end being c arried over a pulley on the outer end of the derrick, and extending to and around a pulley or drum, which, actuated by suitable mechanism in control of the attendant, willwind up the chain and close the jaws of the scoop.

H H are two sockets welded or otherwise securely fastened to and made a part ot' the outer bar of the vertical frame A', which receive and hold the lower end of the guidesticks.

J J are two clasps or rings welded or otherwise securely fastened onto and made a part of the outer bar of the vertical frame A', through which the guide-sticks pass, and by which and the sockets H they are firmly secured in their places.

K K are the guide-sticks, of hickory or other suitable timber.

m fm are two loose sleeves, through which the pivot-bars e' e pass, having shoulders at each end bearing against the inner bars oi' the vertical frame A A'.

n n are two solid iron pulleys on the main shaft F, and securely fastened to it between the bars A and A' of the vertical frame.

n' n' are two chains, one attached securely to each of the solid pulleys n n at such point that when the jaws of the scoop are closed these chains will be wound around the entire circumference of the pulleys a u. The other ends of these chains are securely attached to the lower part of the sliding blocks D D.

Having enumerated and described the several parts of my improved dredging scoop or bucket, I will explain the manner of its use.

The drawings show the scoop or bucket with the jaws closed, as they are when it has taken its load of gravel. In this position itis raised by the usual means to the proper height and carried over the place (scow or car) where or into which its load is to be delivered. The chain g is then wound on its receiving-drum, and thereby the sliding blocks D D are raised to the position shown at D', by which movement the toggle-bars c c c c are made to open the jaws of the scoop or bucket to the position shown by the dotted lines c3, the hingestraps b then standing in the position shown by the dotted lines c4. In this position of the jaws it is obvious that the load in the scoop will be discharged. The chains n' u' will then be unwound from the pulleys n n, and the chain g' will be wound around the large central pulley, Gr. The scoop is then swung over and lowered, with its jaws open, to the gravel or mud to be dredged. The weight of the scoop and its appliances hold it down to the work. rIhen the chain g' is wound up on its receiving-drum, revolving the central pulley, G, and with it the shaftF and the pulleys n a, winding up the chains a' u' on the pulleys un, forcing the sliding blocks D D down, and thus causing the toggle bars c c c c to close the jaws 0f the scoop and take in whatever may be caught between them. Actual use has demonstrated that this dredging-scoop will take afull load from a bed of hard-pan.

My present improvements are shown in the rings J J and sockets H H, in which the guide-sticks are secured and held, the pockets b' b' b b', andthe position of the toggle bars c c c c, as shown at c', whereby they take hold of the two jaws of the scoop at a greater distance from the central line than by the plan shown in my former patent, before referred to, giving a greater leverage and facility in closing the jaws of the scoop. It will also be observed that in my former plan the chain g was attached directly to the back of the jaws of the scoop or bucket, instead of the sliding block, as here shown, and the guide-sticks were placed between the bars of the vertical frame A A'.

I do not now claim asnew anything shown or described in my former patent referred to; but

I do claim as new and my invention- 1. In a dredging scoop or bucket, in combination with the vertical frame A A', the rings or clasps J J `and the sockets H H, substantially as described, for the purpose specitied.

2. In a dredging scoop or bucket, in combination with the sliding blocks D D, togglebars c c c c, and chain g, the pivots e' and sleeves m, all made and arranged substantially as described, for the purpose specilied.

3. In a dredging scoop or bucket, in combination with the toggle-bars c c c c, the pockets b' b b' b', and the pivots c, all made and arranged substantially as described.

ALBERT ELISHA HALL.

In presence of- FRED. L. HoUGH'roN, GHS. HoUGHToN.

IOO 

